Brake fluid is an essential component of your vehicle. It stops the wheels from moving in case of a collision and ensures that the brakes work correctly. However, some vehicles don’t need to bleed as frequently as others, so this may only sometimes be necessary for you.
When you are bleeding your car’s brakes, you want to make sure that there isn’t any excess brake fluid coming out when you do it. If it does happen, then there could be many issues, including no air getting into the calipers, which would cause them to seize up during normal driving conditions or if they have been damaged.
If you are going to bleed your vehicle’s brakes, it is essential to know how much brake fluid you will need. The amount of fluid needed can vary from car to car, but you should generally use about one pint of new brake fluid per wheel when bleeding them.
Why is bleeding brake essential?
Bleeding brakes are essential for ensuring the proper functioning of a vehicle’s braking system. When a brake system is installed or repaired, air can become trapped in the lines, leading to a spongy or unresponsive brake pedal. Bleeding the brakes removes this air, resulting in a firmer pedal feel and improved braking performance.
In addition, over time, brake fluid can become contaminated with moisture, leading to rust and corrosion in the system. This can cause severe damage to the brake components, including the brake lines, calipers, and master cylinder, and reduce the brakes’ overall effectiveness. Bleeding the brakes allows for the removal of contaminated fluid, which can improve the longevity and performance of the brake system.
Moreover, when the brake pedal is depressed, pressure is applied to the brake calipers, which squeeze the brake pads against the rotors, causing the vehicle to stop. If air is present in the brake lines, it can reduce the pressure applied to the calipers, decreasing braking performance. By bleeding the brakes, the air is removed, and the total pressure can be applied to the calipers, resulting in improved braking performance.
Causes of brake fluid not coming out when bleeding:
1. Faulty brake hose:
A faulty brake hose can cause a loss of brake fluid during bleeding. If the brake hose is damaged or leaking, the brake fluid will escape from the system, resulting in a lack of fluid even after bleeding the brakes. This can cause a significant reduction in braking performance and can be dangerous while driving.
It is essential to inspect the brake hoses regularly for any signs of damage or leaks and to have them replaced if necessary. If a significant amount of fluid is lost during the bleeding process, it may indicate a faulty brake hose, and further inspection should be done to diagnose and repair the issue.
2. Low fluid level:
If the brake fluid level is low, you will need to refill the brake fluid reservoir to the correct level before bleeding the brakes. Using the correct brake fluid specified by the vehicle manufacturer is essential.
Once the fluid level has been topped up, follow the proper bleeding procedure for your vehicle, which typically involves opening the bleed screw on the furthest wheel from the master cylinder and having a helper pump the brake pedal.
At the same time, you hold the bleed screw open. Make sure to close the bleed screw before the pedal is released. Repeat this process until clear fluid comes out of the bleed screw with no air bubbles.
If you still have trouble bleeding the brakes after topping up the fluid, you may need assistance from a professional mechanic to diagnose and fix the issue.
3. Failed Master Cylinder:
A failed master cylinder can cause no brake fluid to come out when bleeding the brakes. The master cylinder is responsible for pressurizing the brake system, so if it’s not functioning correctly, the brake fluid won’t flow through the system.
If you suspect a failed master cylinder, you should have the vehicle inspected by a professional mechanic. A failed master cylinder must be replaced to restore proper brake function.
Diagnosing and fixing the issue as soon as possible is essential, as driving a failed master cylinder can be dangerous.
4. Frozen bleeder valves:
When bleeding the brakes, it’s common to experience air bubbles in the system. To remove these air bubbles, you need to open up the bleeders and allow them to escape. This process will only be possible if you have a frozen bleeder valve. The first step when dealing with a frozen bleeder valve is to try and thaw it out with heat.
You can use a heat gun or blow dryer to warm the system. If you have a bleed screw that can be opened by hand, it’s also possible to use a wrench to turn it manually. Once the system has been thawed out, try bleeding your brakes again.
How to fix the issue of no brake fluid coming out when bleeding?
- 1. Check fluid level: The first thing you should do if your brakes are not working and no fluid is coming out when bleeding is to check the fluid level. If it’s low, add more brake fluid until it hits the appropriate mark on the reservoir. .
- 2. Check for a leak: If the fluid is at an appropriate level, check your brake lines for leaks. If you find any, fix them and bleed again. .
- 3. Check for air in the lines: If you’ve checked your fluid level and found no leaks, check for air in your brake lines by opening a bleeder valve and watching for bubbles to come out. If there are bubbles, close the valve and repeat this process until no more bubbles appear..
- 4. Faulty brake Caliper: If you’ve checked your fluid level and found no leaks, check for air in your brake lines by opening a bleeder valve and watching for bubbles to come out. If there are bubbles, close the valve and repeat this process until no more bubbles appear. .
- 5. Clean Brake Lines: If the lines are dirty, clean them with a wire brush or by flushing them out with brake fluid. If your car has ABS brakes, don’t use abrasive cleaners to clean the lines because they can damage sensors and other components..
- 6. Replace the Master Cylinder: If you’ve checked your fluid level and found no leaks, check for air in your brake lines by opening a bleed valve and watching for bubbles to come out. If there are bubbles, close the valve and repeat this process until no more bubbles appear.
Why are my brakes still soft after bleeding?
There could be several reasons why your brakes are still soft after bleeding, including:
- Air in the system: If air is still in the brake line, the brakes will remain soft. It is essential to ensure that all air is removed from the system during the bleeding process..
- Failed master cylinder: If the master cylinder is not functioning correctly, it can cause the brakes to be soft even after bleeding. The master cylinder is responsible for converting the force from the brake pedal into hydraulic pressure to activate the brake calipers..
- Worn brake pads: If the brake pads are worn, they will not be able to generate enough stopping power, resulting in soft brakes..
- Leaks in the brake line: If there are leaks in the brake line, the brake fluid will not be able to effectively transfer the force from the brake pedal to the calipers, resulting in soft brakes..
- Failed calipers or wheel cylinders: If the calipers or wheel cylinders are not functioning correctly, they will not be able to generate enough hydraulic pressure to activate the brakes, resulting in soft brakes.
If your brakes are still soft after bleeding, it is recommended to seek professional assistance to diagnose and repair the issue.